Upper Collinsville
Upper Collinsville is a stone dam located in Hartford County, Connecticut, built in 1837. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Upper Collinsville
Upper Collinsville is a dam in Hartford, Connecticut. The dam is owned by Canton Hydro Llc (state). It impounds the Farmington River near Collinsville.
The dam stands 18 feet tall and stretches 325 feet across, creates a reservoir covering 53 acres, has a maximum storage capacity of 350 acre-feet, and collects water from a drainage area of 360 square miles. Completed in 1837, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/25/2022.
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Location
| State | Connecticut |
| County | Hartford |
| Nearest City | Collinsville |
| River/Stream | Farmington River |
| Coordinates | 41.81030, -72.92600 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 325 ft |
| Year Completed | 1837 (189 years old) |
Storage & Hydraulics
| NID Storage | 350 acre-ft |
| Max Storage | 350 acre-ft |
| Normal Storage | 350 acre-ft |
| Surface Area | 53 acres |
| Drainage Area | 360 sq mi |
| Max Discharge | 55,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | canton hydro llc |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/25/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00674 |
| Federal ID | CT00674 |
| More Info | State Dam Safety Program |